// JavaScript Document
function random_img(imgname){
	var imgArray = new Array();
	imgArray[0] = "images/mount1.jpg";
	imgArray[1] = "images/mount2.jpg";
	imgArray[2] = "images/mount3.jpg";
	imgArray[3] = "images/mount4.jpg";
	imgArray[4] = "images/mount5.jpg";
	
	myVal = Math.floor(Math.random()*imgArray.length);	

	document.getElementById(imgname).src = imgArray[myVal];
}